diff --git a/src/plugins/texteditor/basetexteditor.cpp b/src/plugins/texteditor/basetexteditor.cpp
index 1c7e9d346fc..0f378ea3447 100644
--- a/src/plugins/texteditor/basetexteditor.cpp
+++ b/src/plugins/texteditor/basetexteditor.cpp
@@ -533,6 +533,27 @@ BaseTextEditorWidgetPrivate::BaseTextEditorWidgetPrivate(BaseTextEditorWidget *p
 
 using namespace Internal;
 
+/*!
+ * Test if syntax highlighter is available (or unneeded) for \a widget.
+ * If not found, show a warning with a link to the relevant settings page.
+ */
+static void updateEditorInfoBar(BaseTextEditorWidget *widget)
+{
+    Id infoSyntaxDefinition(Constants::INFO_SYNTAX_DEFINITION);
+    InfoBar *infoBar = widget->textDocument()->infoBar();
+    if (!widget->isMissingSyntaxDefinition()) {
+        infoBar->removeInfo(infoSyntaxDefinition);
+    } else if (infoBar->canInfoBeAdded(infoSyntaxDefinition)) {
+        InfoBarEntry info(infoSyntaxDefinition,
+                          BaseTextEditor::tr("A highlight definition was not found for this file. "
+                                             "Would you like to try to find one?"),
+                          InfoBarEntry::GlobalSuppressionEnabled);
+        info.setCustomButtonInfo(BaseTextEditor::tr("Show Highlighter Options..."),
+                                 widget, SLOT(acceptMissingSyntaxDefinitionInfo()));
+        infoBar->addInfo(info);
+    }
+}
+
 QString BaseTextEditorWidget::plainTextFromSelection(const QTextCursor &cursor) const
 {
     // Copy the selected text as plain text
@@ -6512,11 +6533,9 @@ QColor BaseTextEditorWidget::replacementPenColor(int blockNumber) const
 
 BaseTextEditor *BaseTextEditorWidget::createEditor()
 {
+    QTC_CHECK("should not happen anymore" && false);
     auto editor = new BaseTextEditor;
     editor->setEditorWidget(this);
-    editor->setContext(Core::Context(Core::Constants::K_DEFAULT_TEXT_EDITOR_ID,
-                      TextEditor::Constants::C_TEXTEDITOR));
-    editor->setDuplicateSupported(true);
     return editor;
 }
 
@@ -6555,6 +6574,7 @@ BaseTextEditor::BaseTextEditor()
 {
     d->m_completionAssistProvider = [] () -> CompletionAssistProvider * { return 0; };
     addContext(TextEditor::Constants::C_TEXTEDITOR);
+    setDuplicateSupported(true);
 }
 
 void BaseTextEditor::setEditorWidget(BaseTextEditorWidget *widget)
@@ -7126,7 +7146,7 @@ void BaseTextEditorWidget::configureMimeType(const MimeType &mimeType)
 
     textDocument()->setFontSettings(TextEditorSettings::fontSettings());
 
-    emit configured(editor());
+    updateEditorInfoBar(this);
 }
 
 bool BaseTextEditorWidget::isMissingSyntaxDefinition() const
@@ -7141,26 +7161,27 @@ void BaseTextEditorWidget::acceptMissingSyntaxDefinitionInfo()
                              this);
 }
 
-void BaseTextEditorWidget::configureMimeType()
-{
-    MimeType mimeType;
-    if (textDocument())
-        mimeType = MimeDatabase::findByFile(textDocument()->filePath());
-    configureMimeType(mimeType);
-}
-
 // The remnants of PlainTextEditor.
 void BaseTextEditorWidget::setupAsPlainEditor()
 {
     setRevisionsVisible(true);
     setMarksVisible(true);
     setLineSeparatorsAllowed(true);
+    setLineSeparatorsAllowed(true);
 
     textDocument()->setMimeType(QLatin1String(TextEditor::Constants::C_TEXTEDITOR_MIMETYPE_TEXT));
 
-    connect(textDocument(), SIGNAL(filePathChanged(QString,QString)),
-            this, SLOT(configureMimeType()));
-    connect(Manager::instance(), SIGNAL(mimeTypesRegistered()), this, SLOT(configureMimeType()));
+    auto reconf = [this]() {
+        MimeType mimeType;
+        if (textDocument())
+            mimeType = MimeDatabase::findByFile(textDocument()->filePath());
+        configureMimeType(mimeType);
+    };
+
+    connect(textDocument(), &IDocument::filePathChanged, reconf);
+    connect(Manager::instance(), &Manager::mimeTypesRegistered, reconf);
+
+    updateEditorInfoBar(this);
 }
 
 IEditor *BaseTextEditor::duplicate()
@@ -7169,7 +7190,7 @@ IEditor *BaseTextEditor::duplicate()
     if (d->m_origin)
         return d->m_origin->duplicateTextEditor(this);
 
-    // Use standard setup if that's available.
+    // Use old setup if that's available.
     if (d->m_editorCreator) {
         BaseTextEditor *editor = d->m_editorCreator();
         BaseTextEditorWidget *widget = editor->ensureWidget();
@@ -7178,16 +7199,9 @@ IEditor *BaseTextEditor::duplicate()
         return editor;
     }
 
-    // That's a really plain text editor.
-    auto newWidget = new BaseTextEditorWidget;
-    newWidget->setTextDocument(editorWidget()->textDocumentPtr());
-    newWidget->setupAsPlainEditor();
-    auto editor = newWidget->editor();
-    editor->addContext(Core::Constants::K_DEFAULT_TEXT_EDITOR_ID);
-    editor->setDuplicateSupported(true);
-    return editor;
-
     // If neither is sufficient, you need to implement 'YourEditor::duplicate'.
+    QTC_CHECK(false);
+    return 0;
 }
 
 QWidget *BaseTextEditor::widget() const
@@ -7228,6 +7242,7 @@ BaseTextDocumentPtr BaseTextEditor::ensureDocument()
 BaseTextEditorFactory::BaseTextEditorFactory(QObject *parent)
     : IEditorFactory(parent)
 {
+    m_editorCreator = []() { return new BaseTextEditor; };
     m_widgetCreator = []() { return new BaseTextEditorWidget; };
 }
 
diff --git a/src/plugins/texteditor/basetexteditor.h b/src/plugins/texteditor/basetexteditor.h
index 60c64ec73b9..a52d3ce1af8 100644
--- a/src/plugins/texteditor/basetexteditor.h
+++ b/src/plugins/texteditor/basetexteditor.h
@@ -504,8 +504,6 @@ signals:
     void requestZoomReset();
     void requestBlockUpdate(const QTextBlock &);
 
-    void configured(Core::IEditor *editor);
-
 protected:
     bool event(QEvent *e);
     void inputMethodEvent(QInputMethodEvent *e);
@@ -612,7 +610,6 @@ protected slots:
     virtual void slotCursorPositionChanged(); // Used in VcsBase
     virtual void slotCodeStyleSettingsChanged(const QVariant &); // Used in CppEditor
 
-    void configureMimeType();
     void doFoo();
 
 private:
diff --git a/src/plugins/texteditor/plaintexteditorfactory.cpp b/src/plugins/texteditor/plaintexteditorfactory.cpp
index 40d6e5daa5f..33e8de572e7 100644
--- a/src/plugins/texteditor/plaintexteditorfactory.cpp
+++ b/src/plugins/texteditor/plaintexteditorfactory.cpp
@@ -38,64 +38,36 @@
 
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/infobar.h>
+#include <utils/qtcassert.h>
 
 #include <QCoreApplication>
 #include <QDebug>
 
-using namespace TextEditor;
-using namespace TextEditor::Internal;
+namespace TextEditor {
+namespace Internal {
 
-PlainTextEditorFactory::PlainTextEditorFactory(QObject *parent)
-  : Core::IEditorFactory(parent)
+class PlainTextEditorWidget : public BaseTextEditorWidget
+{
+public:
+    PlainTextEditorWidget() {}
+    void finalizeInitialization() { setupAsPlainEditor(); }
+};
+
+PlainTextEditorFactory::PlainTextEditorFactory()
 {
     setId(Core::Constants::K_DEFAULT_TEXT_EDITOR_ID);
     setDisplayName(qApp->translate("OpenWith::Editors", Core::Constants::K_DEFAULT_TEXT_EDITOR_DISPLAY_NAME));
     addMimeType(QLatin1String(TextEditor::Constants::C_TEXTEDITOR_MIMETYPE_TEXT));
 
-    new TextEditorActionHandler(this,
-        Core::Constants::K_DEFAULT_TEXT_EDITOR_ID,
+    setDocumentCreator([]() { return new BaseTextDocument(Core::Constants::K_DEFAULT_TEXT_EDITOR_ID); });
+    setEditorWidgetCreator([]() { return new PlainTextEditorWidget; });
+    setIndenterCreator([]() { return new NormalIndenter; });
+
+    setEditorActionHandlers(Core::Constants::K_DEFAULT_TEXT_EDITOR_ID,
         TextEditorActionHandler::Format |
         TextEditorActionHandler::UnCommentSelection |
         TextEditorActionHandler::UnCollapseAll);
 }
 
-Core::IEditor *PlainTextEditorFactory::createEditor()
-{
-    BaseTextDocumentPtr doc(new BaseTextDocument(Core::Constants::K_DEFAULT_TEXT_EDITOR_ID));
-    doc->setIndenter(new NormalIndenter);
-    auto widget = new BaseTextEditorWidget;
-    widget->setTextDocument(doc);
-    widget->setupAsPlainEditor();
-    connect(widget, &BaseTextEditorWidget::configured,
-            this, &PlainTextEditorFactory::updateEditorInfoBar);
-    updateEditorInfoBar(widget->editor());
-    return widget->editor();
-}
-
-/*!
- * Test if syntax highlighter is available (or unneeded) for \a editor.
- * If not found, show a warning with a link to the relevant settings page.
- */
-void PlainTextEditorFactory::updateEditorInfoBar(Core::IEditor *editor)
-{
-    BaseTextEditor *textEditor = qobject_cast<BaseTextEditor *>(editor);
-    if (textEditor) {
-        Core::IDocument *file = editor->document();
-        if (!file)
-            return;
-        BaseTextEditorWidget *widget = textEditor->editorWidget();
-        Core::Id infoSyntaxDefinition(Constants::INFO_SYNTAX_DEFINITION);
-        Core::InfoBar *infoBar = file->infoBar();
-        if (!widget->isMissingSyntaxDefinition()) {
-            infoBar->removeInfo(infoSyntaxDefinition);
-        } else if (infoBar->canInfoBeAdded(infoSyntaxDefinition)) {
-            Core::InfoBarEntry info(infoSyntaxDefinition,
-                                    tr("A highlight definition was not found for this file. "
-                                       "Would you like to try to find one?"),
-                                    Core::InfoBarEntry::GlobalSuppressionEnabled);
-            info.setCustomButtonInfo(tr("Show Highlighter Options..."),
-                                     widget, SLOT(acceptMissingSyntaxDefinitionInfo()));
-            infoBar->addInfo(info);
-        }
-    }
-}
+} // namespace Internal
+} // namespace TextEditor
diff --git a/src/plugins/texteditor/plaintexteditorfactory.h b/src/plugins/texteditor/plaintexteditorfactory.h
index 8633fc89498..3ade4c07d56 100644
--- a/src/plugins/texteditor/plaintexteditorfactory.h
+++ b/src/plugins/texteditor/plaintexteditorfactory.h
@@ -30,25 +30,17 @@
 #ifndef PLAINTEXTEDITORFACTORY_H
 #define PLAINTEXTEDITORFACTORY_H
 
-#include <coreplugin/editormanager/ieditorfactory.h>
-
-#include <QStringList>
+#include <texteditor/basetexteditor.h>
 
 namespace TextEditor {
 namespace Internal {
 
-class PlainTextEditorFactory : public Core::IEditorFactory
+class PlainTextEditorFactory : public TextEditor::BaseTextEditorFactory
 {
     Q_OBJECT
 
 public:
-    PlainTextEditorFactory(QObject *parent = 0);
-
-    using Core::IEditorFactory::addMimeType;
-    Core::IEditor *createEditor();
-
-private slots:
-    void updateEditorInfoBar(Core::IEditor *editor);
+    PlainTextEditorFactory();
 };
 
 } // namespace Internal